See also Fallas at 434 [100].
36 I continued (at [162]):
"In this definition 'condition' refers to the factual scenario facing the plaintiff. Thus in a diving case the condition might typically be the fact that the plaintiff is faced with water of unknown depth. Under such a condition the risk would be that diving into the water (while the depth remains unknown) might result in (serious) injury. This risk would be considered obvious if, in the context of the case, it was perceptible to a reasonable person in the position of the plaintiff that if you do not know the depth of a body of water into which you are about to dive, then to dive into such water under such conditions inevitably brings with it the risk of injury."
37 As Hayne J observed in Vairy in the High Court (at 464 [133]), because the water could be too shallow, there was a risk of injury. In the present case the appellant himself recognised that if the depth of water into which he proposed to dive was insufficient, there was a high probability that he would be seriously injured. This is apparent from the following exchange:
"Q. When you dived into this water, you didn't know what depth it was, did you?
A. Not exactly.
Q. And you knew when you dived in, not knowing exactly the depth, that you could become very badly injured if you hit your head on the bottom, didn't you?
A. I thought it was deep enough but.
Q. You knew that if you hit your head on the bottom you could be very badly injured, didn't you?
A. Well I didn't think that I'm going to hit my head at the bottom.
Q. You knew that if you hit your head on the bottom?
A. Yes.
Q. You could be very badly injured?
A. Yes.
Q. Perhaps even killed?
A. Yes.
Q. End up in a wheelchair?
A. Yes."
38 The appellant accepted that he knew in a general sense that diving into shallow water or water of uncertain depth might result in injury and so was aware of what the primary judge referred to as "the potential for danger". It was that "potential for danger" that constituted the relevant risk. It was, on the appellant's own evidence, one that was apparent to him. If so, it was also readily apparent to a reasonable person in his position. It matters not that it had a low probability of occurring: s 5F(3).
39 The fact that the appellant believed that the water was deep enough, because he had purported to check its depth by treading water, does not militate against a finding on the objective facts that there was an "obvious risk" that would be readily apparent to a reasonable person in the appellant's position. A reasonable person in the position of the appellant, wishing to dive head first from the top of a bollard, two to three metres above the surface level of the water, would not regard that method, if it be such, as a reasonable substitute for testing the depth by the more reliable means of "duck diving" or by jumping feet first.
40 Accordingly, in my view the primary judge was correct to find that the relevant risk of harm to which the appellant was exposed was one which was an "obvious risk" within the meaning of s 5F(1) of the CL Act. By virtue of s 5H(1) it follows that the Council did not owe a duty of care to the appellant to warn him of that risk. For this reason alone the appeal must fail.
41 The appellant also challenged the primary judge's finding that the recreational activity undertaken by the appellant was a "dangerous recreational activity" within the meaning of s 5K of the CL Act, in that it involved a significant risk of physical harm. That it involved a risk of such harm is clear. As Hayne J observed in Vairy in a passage to which I have already referred, "because the water could be too shallow, there was a risk of injury". The question was whether that risk was significant. The primary judge held that it was and I agree with that conclusion.
42 The appellant nevertheless submitted that the risk of physical injury, although present, was not "significant" as the appellant dived only from a height of two to three metres into water which he believed, on the basis of observation and by treading water in the vicinity of the dive, to be of sufficient depth to safely accommodate his dive. The fact that he was wrong did not transform the risk into one which was "significant". Reliance was placed upon the following passage from the judgment of Mason P, with whom McColl JA and Hunt AJA agreed, in Lormine Pty Ltd v Xuereb [2006] NSWCA 200 at [31]:
"The defendant bears the burden of establishing a defence under s 5L. The question is to be determined objectively and prospectively. The standard lies somewhere between a trivial risk and one that is likely to occur. Significance is to be informed by the elements of both risk and physical harm. The characterisation must take place in a particular context in which the plaintiff places himself or herself."
43 In Vairy, Gleeson CJ and Kirby J said at 426 [5]:
"Swimming is a popular recreational activity along the Australian coast. It involves certain risks and sometimes results in injury, or even death. The level of risk varies according to the locality, the conditions at any given time, and the capabilities of the swimmers. Short of prohibiting swimming altogether, public authorities cannot eliminate risk. A general prohibition in a given locality may be a gross and inappropriate interference with the public's right to enjoy healthy recreation. Swimmers often enter the water by diving, or plunging head-first. This, also, is risky. Diving into water that is too shallow, or diving too deeply into water in which only a shallow dive is safe, can have catastrophic results."
44 At 428 [10] their Honours also observed:
"In addressing the central question of fact in this particular case, we do not find it helpful to characterise the danger confronting the appellant at the level of diving into water of unknown depth. Such a practice, described in that general fashion, is always risky. There are, however, degrees of risk, and some risk of that kind exists every time a swimmer enters water headfirst without knowing exactly how deep it is. Even if the swimmer knows the depth of water exactly, there are few people who could calculate with any accuracy the risk involved in diving or plunging into it. Most people who plunge headfirst into the surf are taking some degree of risk and, if the risk materialises, the consequences may be devastating."
45 The foregoing passages contain observations made in the context of whether the Council in that case was in breach of its duty of care in failing to warn Mr Vairy of the risk of diving off the rocks. The question with which I am currently concerned in the present case is different. But the passages to which I have referred make clear that anyone who dives headfirst into waters of unknown depth is taking some degree of risk that they will sustain physical harm. Furthermore, the consequences of the risk materialising may be devastating.
46 Thus in Falvo v Australian Oztag Sports Association (2006) Aust Torts Reports 81-831; [2006] NSWCA 17 Ipp JA, with the agreement of Hunt AJA and Adams J, set out the principles as to how an activity is to be characterised to determine if it is a "dangerous recreational activity" in the following terms:
"28 In my view, the definition of 'dangerous recreational activity' in s 5K has to be read as a whole. This requires due weight to be given to the word 'dangerous'. It also requires 'significant' to be construed as bearing not only on 'risk' but on the phrase 'physical harm' as well. The expression 'significant risk of physical harm' is coloured by the word 'dangerous' and the phrase 'significant risk' cannot properly be understood without regard being had to the nature and degree of harm that might be suffered, as well as to the likelihood of the risk materialising.
29 The view that a risk is 'significant' when it is dependant on the materiality of the consequences to the person harmed is consistent with the views expressed by the High Court in Rogers v Whitaker (1992) 175 CLR 479 at 490.
30 Thus, in my opinion, the expression should not be construed, for example, as capable of applying to an activity involving a significant risk of sustaining insignificant physical harm (such as, say, a sprained ankle or a minor scratch to the leg). It is difficult to see how a recreational activity could fairly be regarded as dangerous where there is no more than a significant risk of an insignificant injury.
31 In substance, it seems to me, that the expression constitutes one concept with the risk and the harm mutually informing each other. On this basis the 'risk of physical harm' may be 'significant' if the risk is low but the potential harm is catastrophic. The 'risk of physical harm' may also be 'significant' if the likelihood of both the occurrence and the harm is more than trivial. On the other hand, the 'risk of physical harm' may not be 'significant' if, despite the potentially catastrophic nature of the harm the risk is very slight. It will be a matter of judgment in each individual case whether a particular recreational activity is 'dangerous'."
47 In Fallas Ipp JA, with my concurrence, in a judgment delivered two weeks after his judgment in Falvo, further explained the concept of a "significant risk of physical harm" as follows (at 422):
"13 I agree with Basten JA that an objective test is required in determining whether in terms of s 5K a recreational activity is 'dangerous'.
14 But what does 'significant' mean in s 5K? I think it is plain that it means more than trivial and does not import an 'undemanding' test of foreseeability as laid down in Wyong Shire Council v Shirt (1980) 146 CLR 40.
15 The epithet 'real' was suggested during the course of argument. But 'real' can mean a risk that is not far-fetched or fanciful ( Wyong Shire Council v Shirt at (48)) and 'significant' means more than that.
16 On the other hand, it seems to me, a 'significant risk' does not mean a risk that is likely to occur; that would assign to it too high a degree of probability. Had it been the legislature's intention to lay down an element for the application of s 5L involving the probability of harm occurring, different words would have been used.
17 In the present context, the word 'significant' - coloured or informed as it is by the elements of both risk (which it expressly qualifies) and physical harm (which is indivisibly part of the expression under consideration) - is not susceptible to more precise definition.
18 Thus, I do not think it practicable or desirable to attempt to impose further definition on 'significant', other than saying that the term lays down a standard lying somewhere between a trivial risk and a risk likely to materialise. Where the particular standard lies between these two extremes cannot be prescribed by any rule of thumb. Each individual case will have to depend on its particular circumstances and by having regard to the ordinary meaning of the term."
48 His Honour further emphasised (at 426 [113]) that in order to avoid potential situations of unfairness and injustice, it was appropriate, for the purpose of s 5K, to determine the scope of the recreational activity:
"… by reference to the particular activities actually engaged in by the plaintiff at the relevant time. This would enable a decision to be made by reference to the actual circumstances giving rise to the harm, and not to a notional and artificial construct that bears little relationship to the reality of the case and to what actually occurred."
49 In Fallas Basten JA observed (at 443 [144]) that there were three ways of considering whether the risk of harm was significant of which the first and third are presently relevant. The first was to assume that any risk would be significant because the results of it eventuating were likely to be catastrophic. The third was to look at the particular circumstances of the case. His Honour rejected the first approach (at 443 [145]) as it could result in the phrase "significant risk of physical harm" not being satisfied where the risk was miniscule albeit the harm very serious.
50 Like Ipp and Basten JJA, I also preferred the third approach. I said (at 432):
"90 … If, as I believe to be the case, the word " significant " in the context of the subject definition means a risk which is not merely trivial but, generally speaking, one which has a real chance of materialising, then the subject activity was clearly capable of involving a significant risk of physical harm. This is consistent with the third approach referred to by Basten JA in [144] of his judgment and which I would respectfully adopt as the correct approach to a case of the present kind. …